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吸附制冷中CaCl_2-NH_3的化学吸附前驱态研究 被引量:2

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摘要 作为一种化学吸附制冷工质对,在吸附制冷条件下,CaCl2-NH3在发生化学吸附之前,由于van der waals力相对于化学反应力作用距离比较长,所以一般要先发生物理吸附. 这个状态称为化学吸附前驱态.通过控制氯化钙不同的膨胀、结块现象,在氯络合物的屏蔽系数作用下实现NH3气体分子与Ca2+之间不同的距离长度,从而得到了不同的化学吸附前驱态.结果表明,吸附剂发生严重膨胀现象而没有发生结块现象时,由于化学吸附前驱态中NH3气体分子与Ca2+之间距离较长,吸附过程所需要的活化能增加,吸附剂在反复的吸附、解吸过程中出现衰减现象.而在吸附剂发生结块现象时,由于NH3气体分子与Ca2+之间距离受到有限空间的控制,从化学吸附前驱态过渡到化学吸附态所需要的活化能相对较小,其吸附性能不再出衰减趋势.利用化学吸附前驱态研究了吸附制冷等压线,结果也表明,在Ca2+的分布没有对NH3气体分子的渗透性能产生影响的前提下,化学吸附前驱态对试验结果起着决定性作用.
出处 《中国科学(E辑)》 CSCD 北大核心 2005年第1期31-42,共12页 Science in China(Series E)
基金 国家杰出青年科学基金(批准号:50225621)
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参考文献10

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二级参考文献23

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